SEMITRON® ESD 225 (ESD Acetal)
Material Information
Semitron® ESD 225 is a static dissipative acetal that has the same general properties of unfilled acetal but with additional static dissipative properties. It has a surface resistivity of 10^9 – 10^12. Because of its dissipative properties, Semitron® ESD is ideal for use in applications that give off electrical discharge. Semitron® ESD’s dissipative properties do not rely on humidity to activate, nor are surface treatments necessary. The Semitron® ESD 225 grade in particular may be used in temperatures up to 225º F without degradation and offers a broad chemical resistance and good wear resistance. It is available in a tan or ivory natural color in the forms of sheet and rod.
Application
- Electronic components
- Integrated circuits
- Hard disk drives
- Circuit boards
- Material handling applications
- Electronic printing and reproducing equipment
Properties
- Inherently dissipative
- Surface resistivity of 10^9 – 10^12
- Broad chemical resistance
- Good wear resistance
- No degradation up to 225º F
Physical |
Astm Test Method |
Semitron® 225 |
Semitron® 410C |
Semitron® 500HR |
| Density (lb/in^3) | D792 | 0.048 | 0.051 | 0.083 |
| Specific Gravity | D792 | 1.33 | 1.41 | 2.3 |
| Water Absorption @ 24 hours (%) | D570 | 2 | 0.3 | 0.03 |
Mechanical |
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| Tensile Strength (PSI) | D638 | 6,100 | 9000 | 1100 |
| Tensile Modulus (PSI) | D638 | 225,000 | 850000 | 300000 |
| Tensile Elongation at Yield (%) | D638 | 10 | 2 | 10 |
| Flexural Strength (PSI) | D790 | 6,000 | 12000 | 2200 |
| Flexural Modulus (PSI) | D790 | 190,000 | 850000 | 500000 |
| Compressive Strength (PSI) | D695 | – | 19500 | 4000 |
| Compressive Modulus (PSI) | D695 | – | 600000 | 250000 |
| Izod Impact (Notched), ft-lb/in | D256 | 1.5 | 0.8 | 1 |
| Rockwell Hardness |
D785 | M74 / R109 | M115 / R125 | R50 |
Thermal |
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| Coefficient of Thermal Expansion, 10^-5/°F |
D696 | 9.3 | 1.8 | 5.7 |
| Heat Deflection Temperature 264 psi, ºF | D648 | 225 | 410 | 270 |
| Melting Temperature, °F | D3418 | – | – | 621 |
| Continous Service Temp (Operating), °F | – | 180 | 338 | 500 |
| Flammability Rating | UL94 | HB | V-0 | V-0 |
Electrical |
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| Dielectric Strength, Short Term, (Volts/Mil) @ .125″ Thick |
D149 | 275 | – | 390 |
| Surface Resistivity (ohms/square) | EOS/ESD S11.11 | 10^9-10^10 | 10^4 – 10^6 | 10^10 – 10^12 |
| Dielectric Constant at 1 KHz | D150 | 4.3 | – | 2.9 |
| Dissipation Factor at 1 KHz | D150 | – | – | – |
NOTE:
The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.